4 ms·
There is slightly more daylight than night, both because of the diameter of the sun and atmospheric refraction.
by madcaptenor 4y ago
There is slightly more daylight than night, both because of the diameter of the sun and atmospheric refraction.
- iso1631 4y agoIt would be interesting to see the calculations for it though (with the different twilights too) When doez civil twilight start - is it when the centre of the sun drops below horizon, or a minuteish later when the last part of the sun drops?
- madcaptenor 4y agoIt's when the last part of the sun drops. https://en.wikipedia.org/wiki/Sunrise#Measurement https://en.wikipedia.org/wiki/Sunrise#Measurement - sunrise is when the sun's center is 50 arcminutes below the horizon. 34 arcminutes of that is refraction, and another 16 is from the radius of the sun.